[gnome-documents] books: Don't show "add online sources" when empty

[Bastien Nocera <hadess src gnome org>]

commit 8a35471a788a652fbc3a4eea881dbf66f504c09c
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Dec 16 16:08:12 2014 +0100

    books: Don't show "add online sources" when empty
    
    If there are no books on the system, don't show the "Add online
    sources" link to gnome-control-center.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740974

 src/embed.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/embed.js b/src/embed.js
index 2db07b6..441dd48 100644
--- a/src/embed.js
+++ b/src/embed.js
@@ -146,7 +146,8 @@ const EmptyResultsBox = new Lang.Class({
                                          vexpand: true });
         this._labelsGrid.add(titleLabel);
 
-        if (Application.sourceManager.hasOnlineSources()) {
+        if (Application.sourceManager.hasOnlineSources() ||
+            Application.application.isBooks) {
             titleLabel.valign = Gtk.Align.CENTER;
         } else {
             titleLabel.valign = Gtk.Align.START;